0

162 x 169 = (162)·(169) = (140 + 22)·(160 + 9)
= 224x100 + (   )x10 + 352x10 + 198 =
= 22400 + (   )x10 + 3520 + 198 =     27378

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FirstOuterInnerLast

 

Level

1

2

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How Many

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30

50

  

FOIL method @

 

Example >>>

 34 x 52 =  (30 + 4)·(50 + 2)

 

 

 

  

First

(A + B)·(C + D) = AC + AD + BC + BD

= 30 x 50

= 1500

Outer

(A + B)·(C + D) = AC + AD + BC + BD

= 30 x 2

=     60

Inner

(A + B)·(C + D) = AC + AD + BC + BD

= 4 x 50

=   200

Last

(A + B)·(C + D) = AC + AD + BC + BD

= 4 x 2

=       8

 

 

    

 

  

 

= 1768